In your mixer, cream butter, sugar and brown sugar.
Add egg, egg yolk and vanilla and mix well.
To the sugar mixture, add flour, baking soda, corn starch and salt. Mix just until combined. Don't overmix!
Add in M&Ms, peanuts and candy corn and mix until just combined. You might even want to just hand-mix these in so you get them mixed in but don't overmix the dough.
Drop cookies on a cookie tray and bake for 8-10 minutes
Let the cookies sit on the cookie tray after you remove them from the oven for a few minutes.
Makes 2 dozen.
Recipe by Reality Daydream at https://realitydaydream.com/soft-batch-candy-corn-gorp-cookies/